50 OPTICAL ILLUSIONS

This title includes fifty cards featuring mind-bending illusions to surprise your eyes, taken from the personal collection of Al Sec kel, world expert on visual illusions. An optical illusion on each card is accompanied by text on the reverse explaining how the ill usion works in tricking the eye. This title comes with a 'revealer' card, which can be used to measure and check the illustrations t o increase understanding of how each illusion works.